心脏传导阻滞SCN5A基因L1001Q突变体构建和功能研究

目的对作者发现的一个中国3代人心脏传导阻滞家系SCN5A基因新突变L1001Q,构建突变表达载体,利用分子生物学方法和全细胞膜片钳技术观察L1001Q突变的功能。方法一步定点诱变法构建pEGFP-L1001Q-SCN5A突变体;激光共聚焦和Western blotting技术检测突变蛋白定位和表达;全细胞膜片钳技术观察突变体钠电流。结果野生型和L1001Q突变均表达在细胞膜上,且表达量无明显变化。二者最大激活电流分别为(148.34±0.77)pA/pF和(132.59±0.96)pA/pF(P>0.05),L1001Q突变半失活电压V1/2为(-73.25±0.87)mV,较野生型正向...

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Published in西安交通大学学报（医学版） Vol. 33; no. 5; pp. 593 - 597
Main Authors 周熙惠, 惠智艳, 史瑞明, 高锦伟, 梁潇, 李溪, 肖丹丹
Format Journal Article
LanguageChinese
Published 西安交通大学医学院第一附属医院新生儿科,环境与疾病相关基因教育部重点实验室,陕西西安710061 2012
Subjects
SCN5A
基因突变
基因表达载体
心脏传导阻滞
膜片钳
钠通道
基因表达载体
心脏传导阻滞
SCN5A
膜片钳
钠通道
基因突变
Online AccessGet full text
ISSN1671-8259
DOI10.3969/j.issn.1671-8259.2012.05.014

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Abstract 目的对作者发现的一个中国3代人心脏传导阻滞家系SCN5A基因新突变L1001Q,构建突变表达载体,利用分子生物学方法和全细胞膜片钳技术观察L1001Q突变的功能。方法一步定点诱变法构建pEGFP-L1001Q-SCN5A突变体;激光共聚焦和Western blotting技术检测突变蛋白定位和表达;全细胞膜片钳技术观察突变体钠电流。结果野生型和L1001Q突变均表达在细胞膜上,且表达量无明显变化。二者最大激活电流分别为(148.34±0.77)pA/pF和(132.59±0.96)pA/pF(P>0.05),L1001Q突变半失活电压V1/2为(-73.25±0.87)mV,较野生型正向转移约3.5mV[V1/2为(-76.71±0.73)mV,P<0.05],L1001Q突变失活后恢复时间常数较野生型稍减小,差异无统计学意义(WT tau=16.8ms,L1001Qtau=14.1ms,P>0.05)。结论 L1001Q突变未影响钠通道蛋白的表达和转运,主要通过改变钠通道门控特性引起钠通道功能减弱进而导致心脏传导阻滞。
AbstractList R541.7; 目的 对作者发现的一个中国3代人心脏传导阻滞家系SCN5A基因新突变L1001Q,构建突变表达载体,利用分子生物学方法和全细胞膜片钳技术观察L1001Q突变的功能.方法 一步定点诱变法构建pEGFP-L1001QSCN5A突变体;激光共聚焦和Western blotting技术检测突变蛋白定位和表达;全细胞膜片钳技术观察突变体钠电流.结果 野生型和L1001Q突变均表达在细胞膜上,且表达量无明显变化.二者最大激活电流分别为(148.34±0.77) pA/pF和(132.59±0.96)pA/pF(P＞0.05),L1001Q突变半失活电压V1/2为(-73.25±0.87)mV,较野生型正向转移约3.5 mV[V1/2为(-76.71±0.73)mV,P＜0.05],L1001Q突变失活后恢复时间常数较野生型稍减小,差异无统计学意义(WT tau=16.8 ms,L1001Qtau=14.1ms,P＞0.05).结论 L1001Q突变未影响钠通道蛋白的表达和转运,主要通过改变钠通道门控特性引起钠通道功能减弱进而导致心脏传导阻滞.
目的对作者发现的一个中国3代人心脏传导阻滞家系SCN5A基因新突变L1001Q,构建突变表达载体,利用分子生物学方法和全细胞膜片钳技术观察L1001Q突变的功能。方法一步定点诱变法构建pEGFP-L1001Q-SCN5A突变体;激光共聚焦和Western blotting技术检测突变蛋白定位和表达;全细胞膜片钳技术观察突变体钠电流。结果野生型和L1001Q突变均表达在细胞膜上,且表达量无明显变化。二者最大激活电流分别为(148.34±0.77)pA/pF和(132.59±0.96)pA/pF(P>0.05),L1001Q突变半失活电压V1/2为(-73.25±0.87)mV,较野生型正向转移约3.5mV[V1/2为(-76.71±0.73)mV,P<0.05],L1001Q突变失活后恢复时间常数较野生型稍减小,差异无统计学意义(WT tau=16.8ms,L1001Qtau=14.1ms,P>0.05)。结论 L1001Q突变未影响钠通道蛋白的表达和转运,主要通过改变钠通道门控特性引起钠通道功能减弱进而导致心脏传导阻滞。
Author 李溪
惠智艳
周熙惠
高锦伟
肖丹丹
史瑞明
梁潇
AuthorAffiliation 西安交通大学医学院第一附属医院新生儿科,环境与疾病相关基因教育部重点实验室,陕西西安710061
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LI Xi
SHI Rui-ming
GAO Jin-wei
XIAO Dan-dan
LIANG Xiao
ZHOU Xi-hui
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心脏传导阻滞
SCN5A
膜片钳
钠通道
基因突变
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Snippet 目的对作者发现的一个中国3代人心脏传导阻滞家系SCN5A基因新突变L1001Q,构建突变表达载体,利用分子生物学方法和全细胞膜片钳技术观察L1001Q突变的功能。方法一步定点诱变法...
R541.7; 目的 对作者发现的一个中国3代人心脏传导阻滞家系SCN5A基因新突变L1001Q,构建突变表达载体,利用分子生物学方法和全细胞膜片钳技术观察L1001Q突变的功能.方法 一步...
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SubjectTerms SCN5A
基因突变
基因表达载体
心脏传导阻滞
膜片钳
钠通道
Title 心脏传导阻滞SCN5A基因L1001Q突变体构建和功能研究
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